import { App, Button, Card, Input, Space, Typography } from "antd";
import { useEffect, useMemo, useState } from "react";
import { useNavigate, useParams, useSearchParams } from "react-router-dom";

import { getMeetingPreviewAccess, getPublicMeetingPreview } from "@/api/meeting";
import LoadingScreen from "@/components/LoadingScreen";
import PageHeader from "@/components/PageHeader";
import MeetingPreviewView from "@/components/preview/MeetingPreviewView";
import usePageTitle from "@/hooks/usePageTitle";
import type { MeetingChapterVO, MeetingTranscriptVO, MeetingVO } from "@/types";
import { hasAccessToken } from "@/utils/auth";
import { buildMeetingPreviewUrl } from "@/utils/meeting";

const { Paragraph, Title } = Typography;

export default function MeetingPreviewPage() {
  const { message } = App.useApp();
  const navigate = useNavigate();
  const { id } = useParams<{ id: string }>();
  const [searchParams] = useSearchParams();
  const [loading, setLoading] = useState(true);
  const [meeting, setMeeting] = useState<MeetingVO | null>(null);
  const [transcripts, setTranscripts] = useState<MeetingTranscriptVO[]>([]);
  const [chapters, setChapters] = useState<MeetingChapterVO[]>([]);
  const [passwordRequired, setPasswordRequired] = useState(false);
  const [passwordVerified, setPasswordVerified] = useState(false);
  const [accessPassword, setAccessPassword] = useState("");

  const meetingId = useMemo(() => Number(id), [id]);
  const presetAccessPassword = useMemo(() => (searchParams.get("accessPassword") || "").trim(), [searchParams]);
  usePageTitle(meeting?.title || "会议预览");

  const handleBack = () => {
    navigate(hasAccessToken() ? "/meetings" : "/login", { replace: true });
  };

  const loadPreview = async (password?: string) => {
    const previewResp = await getPublicMeetingPreview(meetingId, password);
    setMeeting(previewResp.data.data.meeting);
    setTranscripts(previewResp.data.data.transcripts || []);
    setChapters(previewResp.data.data.chapters || []);
    setPasswordVerified(true);
  };

  useEffect(() => {
    const run = async () => {
      if (!meetingId || Number.isNaN(meetingId)) {
        message.error("会议编号无效");
        setLoading(false);
        return;
      }

      setLoading(true);
      try {
        const accessResp = await getMeetingPreviewAccess(meetingId);
        const required = !!accessResp.data.data.passwordRequired;
        setPasswordRequired(required);

        if (!required) {
          await loadPreview();
          return;
        }

        if (presetAccessPassword) {
          try {
            await loadPreview(presetAccessPassword);
            setAccessPassword(presetAccessPassword);
            return;
          } catch {
            setPasswordVerified(false);
          }
        }
      } finally {
        setLoading(false);
      }
    };

    void run();
  }, [meetingId, presetAccessPassword, message]);

  const handleSubmitPassword = async () => {
    if (!accessPassword.trim()) {
      return;
    }
    setLoading(true);
    try {
      await loadPreview(accessPassword.trim());
      message.success("访问校验通过");
    } catch {
      message.error("访问密码错误");
    } finally {
      setLoading(false);
    }
  };

  if (loading && !meeting && !passwordRequired) {
    return <LoadingScreen text="正在加载会议预览..." />;
  }

  if (passwordRequired && !passwordVerified) {
    return (
      <div className="preview-page">
        <div className="preview-page__inner">
          <PageHeader title="分享预览" back onBack={handleBack} />
          <Card className="surface-card preview-password-card">
            <Title level={3}>会议预览</Title>
            <Paragraph type="secondary">该会议已设置访问密码，请输入密码后继续访问分享内容。</Paragraph>
            <Space direction="vertical" size={16} style={{ width: "100%" }}>
              <Input.Password
                value={accessPassword}
                placeholder="请输入访问密码"
                onChange={(event) => setAccessPassword(event.target.value)}
                onPressEnter={() => void handleSubmitPassword()}
              />
              <Button type="primary" block loading={loading} onClick={() => void handleSubmitPassword()}>
                进入预览
              </Button>
            </Space>
          </Card>
        </div>
      </div>
    );
  }

  if (!meeting) {
    return <LoadingScreen text="未找到会议内容" />;
  }

  return (
    <div className="preview-page">
      <div className="preview-page__inner">
        <PageHeader title="分享预览" back onBack={handleBack} />
        <MeetingPreviewView
          meeting={meeting}
          transcripts={transcripts}
          meetingChapters={chapters}
          shareUrl={buildMeetingPreviewUrl(meeting.id)}
        />
      </div>
    </div>
  );
}